GeForce 8800 GTS (G92) vs GeForce GT 420

Intro

Compare all of that to the GeForce GT 420, which has a GPU core clock speed of 700 MHz, and 2048 MB of GDDR3 RAM set to run at 900 MHz through a 128-bit bus. It also is comprised of 48 SPUs, 8 Texture Address Units, and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce 8800 GTS (G92)		135 Watts
	Difference: 85 Watts (170%)

Memory Bandwidth

The GeForce 8800 GTS (G92) should in theory perform quite a bit faster than the GeForce GT 420 in general. (explain)

GeForce 8800 GTS (G92)		62080 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 33280 (116%)

Texel Rate

The GeForce 8800 GTS (G92) is much (about 643%) faster with regards to AF than the GeForce GT 420. (explain)

GeForce 8800 GTS (G92)		41600 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 36000 (643%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce 8800 GTS (G92) is the winner, by far. (explain)

GeForce 8800 GTS (G92)		10400 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 7600 (271%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of data (counted in MB per second) that can be moved across the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.